Infratech 240 V Surface Mount Double Control Weatherproof Assembly, model 14 4225, is one of the highest quality units available on the market. It comprises of 2 INF input regulators, a weatherproof cover and a gang box. INF controls are an economical option to affect the intensity of infrared heaters. Its INF regulators work like a temperature control on an appliance and are heat sensitive. The setting selected dictates how often the heater will oscillate off and on.